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　　4.5 Caps for liquid delivery line.
　　
　　4.6 Vacuum pump of sufficient capacity to evacuate tank to -2.49 kPa (254 mm water column, gauge vacuum).
　　
　　4.7 Pressure and vacuum supply hose of 6.4 mm internal diameter.
　　
　　4.8 In-line, pressure-vacuum relief valve set and checked to activate at 6.9 kPa (704 mm water column, gauge) and -2.49 kPa (254 mm water column, gauge vacuum) and with a capacity equal to the pressurizing or evacuating pumps.
　　
　　5. Test procedure
　　
　　5.1 Static pressure performance, positive pressurization
　　
　　5.1.1 Static pressure performance measurement
　　
　　(a) Check all the pressure/vacuum valves serving the petrol delivery tanks to ensure that they are working properly.
　　
　　(b) Open and close the dome covers.
　　
　　(c) Connect static electrical ground connections to tank. Attach the delivery and vapour hoses, remove the delivery elbows and plug the liquid delivery fittings.
　　
　　(d) Attach the test cap to the vapour recovery line of the regulated vehicle.
　　
　　(e) Connect the pressure and vacuum supply hose and the pressure-vacuum relief valve to the shut-off valve. Attach the pressure source to the hose. Attach a manometer to the pressure tap.
　　
　　(f) Connect compartments of the petrol delivery tank internally to each other if possible.
　　
　　(g) Apply air pressure slowly, pressurize the tank, or alternatively the first compartment, to 4.48 kPa (457 mm water column, gauge).
　　
　　(h) Close the shut-off valve, allow the pressure in the petrol delivery tank to stabilize (adjust the pressure if necessary to maintain 4.48 kPa (457 mm water column, gauge)), record the time and initial pressure.
　　
　　(i) At the end of 5 minutes, record the final time and pressure.5.1.2 Pressure change from 4.48 kPa (457 mm water column, gauge)
　　
　　(a) Calculate the pressure change from 4.48 kPa (457 mm water column, gauge) to the final pressure, and compare the pressure change to the requirements in section 2.2.
　　
　　(b) Repeat for each compartment if they were not interconnected.
　　
　　5.2 Static pressure performance, negative pressurization
　　
　　This procedure does not apply unless pressurized air lines or other equipment penetrate the petrol delivery tank headspace.
　　
　　5.2.1 Static pressure performance measurement
　　
　　(a) Check all the pressure/vacuum valves serving the petrol delivery tanks to ensure that they are working properly.
　　
　　(b) Connect vacuum source to the pressure and vacuum supply hose.
　　
　　(c) Slowly evacuate the petrol delivery tank, or alternatively the first compartment, to -1.49 kPa (152 mm water column, gauge vacuum). Close the shut-off valve, allow the pressure in the petrol delivery tank to stabilize (adjust the pressure if necessary to maintain -1.49 kPa (152 mm water column, gauge vacuum)), record the time and initial pressure. At the end of 5 minutes, record the final time and pressure.5.2.2 Pressure change from -1.49 kPa (152 mm water column, gauge vacuum)
　　
　　Calculate the pressure change from -1.49 kPa (152 mm water column, gauge vacuum) to the final pressure, and compare the pressure change to the requirements in section 2.2.
　　
　　5.3 Internal vapour valve performance, positive pressurization
　　
　　5.3.1 Static pressure performance measurement
　　
　　(a) After completing the pressure and vacuum tests, pressurize the petrol delivery tank as in section 5.1 to 4.48 kPa (457 mm water column, gauge).
　　
　　(b) Close the petrol delivery tank's internal valve(s) including the internal vapour valve(s), thereby isolating the vapour return line and manifold from the petrol delivery tank.
　　
　　(c) Relieve the pressure in the vapour return line to atmospheric pressure.
　　
　　(d) Seal the vapour return line and after 5 minutes record the gauge pressure existing in the vapour return line and manifold.5.3.2 Pressure change from 4.48 kPa (457 mm water column, gauge)
　　
　　Calculate the pressure change from 4.48 kPa (457 mm water column, gauge) to the final pressure, and compare the pressure change to requirements in section 2.3.
　　
　　Cap 311S Sched 2 PRESSURE DECAY TEST FOR THE VAPOUR RECOVERY SYSTEM OF A PETROL FILLING STATION
　　
　　[sections 3 & 4]
　　
　　1. General
　　
　　This procedure applies to the determination of the tightness of vapour recovery system of a petrol storage tank in a petrol filling station.
　　
　　2. Determination of compliance
　　
　　2.1 The outlet of any vent pipe serving the vapour recovery system shall be fitted with a pressure/vacuum valve and shall be located at least 3.75 m above the ground level.
　　
　　2.2 The following requirements shall also be complied with-
　　
　　Ullage*
　　
　　(litres)
　　
　　Minimum acceptable
　　
　　remaining pressure
　　
　　after 5 minutes
　　
　　(kPa (mm water
　　
　　column, gauge))
　　
　　Ullage
　　
　　(litres)
　　
　　Minimum acceptable
　　
　　remaining pressure
　　
　　after 5 minutes
　　
　　(kPa (mm water
　　
　　column, gauge))
　　
　　1895
　　
　　0.92 (94)
　　
　　11370
　　
　　2.17 (221)
　　
　　2274
　　
　　1.12 (114)
　　
　　13265
　　
　　2.22 (226)
　　
　　2653
　　
　　1.29 (132)
　　
　　15160
　　
　　2.26 (231)
　　
　　3032
　　
　　1.44 (147)
　　
　　17055
　　
　　2.29 (234)
　　
　　3411
　　
　　1.54 (157)
　　
　　18950
　　
　　2.31 (236)
　　
　　3790
　　
　　1.62 (165)
　　
　　28425
　　
　　2.36 (241)
　　
　　5685
　　
　　1.89 (193)
　　
　　37900
　　
　　2.39 (244)
　　
　　7580
　　
　　2.04 (208)
　　
　　56850
　　
　　2.41 (246)
　　
　　9475
　　
　　2.12 (216)
　　
　　113700
　　
　　2.45 (250)
　　
　　* For the intermediate values of ullage space, interpolation between values should be made as set out in section 6 for the calculation of the minimum acceptable remaining pressure.

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